Lock



FIG. 1 is a first perspective view of the invention.

FIG. 2 is a second perspective view of the invention.

FIG. 3 is a side view of the invention.

FIG. 4 is a first plan view of the invention.

FIG. 5 is a second plan view of the invention.

FIG. 6 is a first end view of the invention; and,

FIG. 7 is a second end view of the invention.

The broken lines are for illustrative purpose only and form no part of the claimed design. 

The ornamental design for a lock, as shown and described. 